GT2 timing pulleys, 16T–60T (2 mm pitch) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/gt2-pulleys/  (CC BY 4.0)
Basis: GT2 (2 mm pitch) geometry: pitch diameter = teeth × 2 / π, OD = PD − 0.508 mm; flange and hub sizes typical of printer-kit aluminium pulleys
Catalog version: 2026-10-20

Sizes: see table below
- Pitch diameter sets the motion: 20T = 12.73 mm PD, so one motor turn moves the belt 40 mm. OD is 0.508 mm less than PD.
- Common bores 5 mm (NEMA 17) and 8 mm (idler shafts). Belt widths 6 mm (standard) and 10 mm (heavier axes).
- Tooth profile in these files is an approximation for fit and clearance, not a belt-grade profile; buy the aluminium pulley for the drive.

teeth  pitch_dia_mm  od_mm  flange_dia_mm  belt_mm  bore_mm
16  10.19  9.68  12.7  6  5
20  12.73  12.22  15.2  6  5
20  12.73  12.22  15.2  6  8
36  22.92  22.41  25.4  6  5
40  25.46  24.96  28.0  6  5
60  38.2  37.69  40.7  6  8
20  12.73  12.22  15.2  10  5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Timing belt (camshaft) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Timing_belt_(camshaft)
- Gates: PowerGrip GT2 belt and pulley design guide — PDF — Gates site terms [verify license at link] — https://www.gates.com/us/en/power-transmission/synchronous-belts/powergrip-gt2.html

Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/gt2-pulleys/index.json
API: https://xemstudio.com/api/geometry?object=gt2-pulleys